GB 3296-1982 Determination of light transmittance of daily-use ceramics

This method is applicable to the determination of the light transmittance of daily-use ceramics. GB 3296-1982 Determination of the light transmittance of daily-use ceramics GB3296-1982 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test method for transparency of domestic porcelain ware
Standard test method for transparency of domestic porcelain ware
This method is applicable to the test of the transmittance of domestic porcelain ware. UDC 666.5/.6
GB 3296 --- 82
When parallel light with an intensity of is irradiated vertically on the sample, the intensity of the transmitted light is. When the incident light intensity and its spectral distribution are constant, the following relationship approximately exists:
Wherein: d-
Sample thickness, mm,
Extinction coefficient.
From the above formula, it can be seen that when d=1 mm, the logarithm of the ratio is negative. This standard determines that the measured extinction coefficient is used to measure the light transmittance of the sample. Test instrument
Measurement is carried out with a transmittance meter.
One 1.2 kcal.
2 Sampling regulations
2.1 Take three small pieces of about 15×15 square millimeters from the same product to be inspected. 2.2 Grind the three small pieces of samples to a thickness of approximately 0.500, 1.000 and 1.500 mm respectively. 2.2.1 The thickness of the test piece is uniform, and the thickness measurement is required to be accurate to 0.01 mm. 2.2.2 The last process of grinding the test piece is: polishing with magnesium oxide powder (CP) to make the upper and lower surfaces smooth and flat. 2.2.3 The middle layer of the sample glaze must be ground off. 3 Measurement method
The power supply voltage must meet the instrument requirements and must not exceed ±2%. 3.1
Adjust the instrument so that when there is no sample in the light path, the instrument indication is 100. 3.2
3.3 Insert the test piece, and the instrument indication is the relative light transmittance of the sample. 4 Test results
Fill in the following table with the obtained data:
Test piece thickness
Relative light transmittance
log ht/Ig
National Bureau of Standards Issued on November 19, 1982bZxz.net
Implementation on August 1, 1988
GB 329682
4.2 Take log/ as the vertical axis and d as the horizontal axis to draw a graph, and get a straight line approximately. The slope of this straight line is the obtained e. For the convenience of expression, calculate 10-e×100, and get the relative percentage intensity of the light transmitted through the sample with a thickness of 1 mm, with the incident light intensity as 100. This relative percentage intensity is used to express the light transmittance of the sample. Additional remarks:
This standard was proposed by the First Light Industry Bureau of the Ministry of Light Industry of the People's Republic of China and is under the jurisdiction of the Ceramic Industry Science Research Institute of the Ministry of Light Industry. This standard was drafted by the Ceramic Industry Science Research Institute of the Ministry of Light Industry.
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